# Address-Family: General EIGRP configuration commands are available in this mode. Show
The other two configuration modes of named EIGRP are accessed from this mode. Multiple address families (IPv4 and IPv6) may be configured within the same EIGRP virtual instance. To enter EIGRP Address-family configuration mode, issue the following command from EIGRP router configuration mode: Router(config-router)# address-family ipv4 unicast autonomous-system asn The following commands are available in Address-family configuration mode: af-interface # Address-Family-Interface: This mode takes all the interface specific commands that were previously configured on an actual interface (logical or physical). To enter Address-Family Interface mode, issue the following command from Address Family configuration mode: Router(config-router-af)# af-interface type number These commands may be issued in this mode: authentication # Address-Family-Topology: This mode provides several configuration options which operate on the EIGRP topology table. To enter Address-Family Topology mode, issue the following command from Address Family configuration mode: Router(config-router-af)# topology base The following commands can be issued from this mode: auto-summary Among AR500 series routers, AR503EDGW-Lo, AR503EDGW-Lc, AR503EDGW-Lc3, AR503EW, AR503EQGW-L, AR503GW-LM7, AR503GW-LcM7, AR503GW-Lo, AR509G-Lc, AR509G-L-D-H, AR509GW-L-D-H, AR503HGW-L, and AR503HGW-Lc support IPv6 IS-IS. The AR510 series routers (except AR515GW-LM9-D and AR515CGW-L) do not support IPv6 IS-IS. The AR550 series (except AR550E) routers support IPv6 IS-IS.
ipv6 auto-cost enableFunctionThe ipv6 auto-cost enable command enables IS-IS to automatically calculate the interface cost on an IPv6 network according to the interface bandwidth. The undo ipv6 auto-cost enable command disables IS-IS from automatically calculating the interface cost on an IPv6 network according to the interface bandwidth. By default, the automatic interface cost calculation function is disabled on an IPv6 network. Formatipv6 auto-cost enable [ compatible ] undo ipv6 auto-cost enable Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario After the function is enabled, for a certain IS-IS interface, if the cost of the interface is not configured in the interface view, and the global cost is not configured in the IS-IS view, the system calculates the cost for the interface automatically. If the cost style of the system is wide or wide-compatible: When auto-cost enable command is configured, Interface cost = (Bandwidth-reference/Link-bandwidth) x 10. When auto-cost enable compatible command is configured, Interface cost = (Bandwidth-reference/Link-bandwidth). The cost style is set by the cost-style command. The Bandwidth-reference is set by the ipv6 bandwidth-reference command. The Link-bandwidth is the interface bandwidth. If the cost-style of the system is narrow, narrow-compatible, or compatible, the cost of each interface is determined according to the following table. Table 9-116 Relationship of the IS-IS interface cost and the bandwidth
Precautions The priority of the cost value of the global IPv6 configured by the ipv6 circuit-cost command is higher than the auto cost value. This command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. The ipv6 auto-cost enable command cannot change the cost of the loopback interface. Example# Enable IS-IS to automatically calculate the interface cost on an IPv6 network according to the interface bandwidth. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1 [Huawei-isis-1] ipv6 enable [Huawei-isis-1] ipv6 auto-cost enable ipv6 bandwidth-referenceFunctionThe ipv6 bandwidth-reference command sets the bandwidth reference value used in automatic interface cost calculation on an IPv6 network. The undo ipv6 bandwidth-reference command restores the default setting. By default, the bandwidth reference value is 100 Mbit/s. Formatipv6 bandwidth-reference bandwidth-reference-value undo ipv6 bandwidth-reference Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario To make the link cost of IS-IS routes reflect the actual link cost, configure a proper link cost for all interfaces or enable the automatic interface cost calculation function. To enable automatic interface cost calculation, set a proper bandwidth reference value. You can run the ipv6 bandwidth-reference command to set a proper reference bandwidth value. After the automatic interface cost calculation function is enabled, the system automatically calculates the interface cost according to the bandwidth reference value set using the command. Precautions The ipv6 bandwidth-reference command takes effect only after IPv6 is enabled for the IS-IS process using the ipv6 enable command. Example# Set the IPv6 reference bandwidth value used in automatic interface cost calculation to 200 Mbit/s. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 bandwidth-reference 200ipv6 circuit-costFunctionThe ipv6 circuit-cost command sets the cost value of all IPv6 interfaces in IS-IS SPF calculation, that is, the global IPv6 cost value. The undo ipv6 circuit-cost command deletes the configured global IPv6 cost value. By default, the global IPv6 cost value is not set. Formatipv6 circuit-cost { cost | maximum } [ level-1 | level-2 ] undo ipv6 circuit-cost [ cost | maximum ] [ level-1 | level-2 ] Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario Generally, multiple valid routes to the same destination are available on large IPv6 networks. IS-IS calculates the optimal routes using SPF calculation and chooses the optimal routes for traffic forwarding. This process often causes the following two problems:
To solve the preceding problems, run the ipv6 circuit-cost command to change the cost value of all interfaces at a time and traffic can be forwarded through different physical links. Precautions The priority of the IPv6 cost value on the interface is higher than the priority of the global IPv6 cost value. The ipv6 circuit-cost command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Example# Set the global IPv6 cost value in SPF calculation to 20. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 circuit-cost 20ipv6 circuit default-tagFunctionThe ipv6 circuit default-tag command sets the administrative tag value of all interfaces in IS-IS processes on an IPv6 network. The undo ipv6 circuit default-tag command restores the default tag value. By default, the administrative tag value of all interfaces in IS-IS processes on an IPv6 network is 0. Formatipv6 circuit default-tag tag [ level-1 | level-2 ] undo ipv6 circuit default-tag [ tag ] [ level-1 | level-2 ] Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario Using the ipv6 circuit default-tag command, you can set the administrative tag value for all routes of a specified IS-IS process and use the tag to filter routes. The administrative tag value is advertised together with the routing information.
Precautions The ipv6 circuit default-tag command takes effect only after IPv6 is enabled for the IS-IS process using the ipv6 enable command. Example# Set the administrative tag value for a Level-1 IPv6 interface to 30. <Huawei> system-view [Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 circuit default-tag 30 level-1ipv6 default-route-advertiseFunctionThe ipv6 default-route-advertise command configures the industrial switch router to advertise default IPv6 routes. The undo ipv6 default-route-advertise disables the industrial switch router from advertising default IPv6 routes. By default, the industrial switch router does not advertise default IPv6 routes. Formatipv6 default-route-advertise [ always | match default | route-policy route-policy-name ] [ cost cost | tag tag | [ level-1 | level-2 | level-1-2 ] ] * [ avoid-learning ] undo ipv6 default-route-advertise Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario Generally, if other routing protocols are configured on an IS-IS network, to forward traffic in the IS-IS routing domain outside the domain, use the following two methods:
Advertising default routes is easy to configure and does not require an IS-IS process to learn external routes. You can run the ipv6 default-route-advertise command to configure IS-IS devices to advertise default routes into the IS-IS routing domain. Precautions Using the route-policy, you can force IS-IS to generate default routes only when there are matched routes in the routing table.
The ipv6 default-route-advertise command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Precautions Creating a route-policy before it is referenced is recommended. By default, nonexistent route-policies cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent route-policy is referenced using the current command, an ABR advertises the default IPv6 route to the IS-IS domain as long as the local routing table contains external routes. Example# Configure the current industrial switch router to generate default IPv6 routes in Level-1-2 LSPs. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 default-route-advertise level-1-2ipv6 enable(IS-IS)FunctionThe ipv6 enable command enables the IPv6 capability of an IS-IS process. The undo ipv6 enable command disables the IPv6 capability of an IS-IS process. By default, the IPv6 capability of an IS-IS process is disabled. Formatipv6 enable [ topology { compatible [ enable-mt-spf ] | ipv6 | standard } ] undo ipv6 enable Parameters
Default Level2: Configuration level Usage GuidelinesTo enable the IPv6 capability of an IS-IS process, perform the following operations:
Example# Enable the IPv6 capability in the IPv6 topology in IS-IS process 1. <Huawei> system-view [Huawei] ipv6 [Huawei] isis 1 [Huawei-isis-1] network-entity 10.0001.1010.1020.1030.00 [Huawei-isis-1] ipv6 enable topology ipv6 ipv6 filter-policy exportFunctionThe ipv6 filter-policy export command configures a filtering policy to allow IS-IS to filter the imported IPv6 routes to be advertised. The undo ipv6 filter-policy export command cancels the filtering function. By default, IS-IS does not filter imported IPv6 routes to be advertised. Formatipv6 filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } export [ protocol [ process-id ] | unr ] undo ipv6 filter-policy [ acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name ] export [ protocol [ process-id ] | unr ] Parameters
Default Level2: Configuration level Usage GuidelinesThe ipv6 filter-policy export command together with the ipv6 import-route command can be used to filter only the imported routes that are advertised to other industrial switch routers. If protocol is not specified, the routes that are imported from all other protocols are filtered. If protocol is specified, the routes that are imported from the specific protocol are filtered. The ipv6 filter-policy export command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Example# Configure IS-IS to filter the imported IPv6 routes before advertising the routes to other industrial switch routers. <Huawei> system-view[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 filter-policy route-policy test exportipv6 filter-policy importFunctionThe ipv6 filter-policy import command configures a filtering policy to allow IS-IS to filter the received routes to be added to the IPv6 routing table. The undo ipv6 filter-policy import command cancels the filtering function. By default, IS-IS does not filter the received routes to be added to the IPv6 routing table. Formatipv6 filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } import undo ipv6 filter-policy [ acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name ] import Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario IS-IS routing entries need to be added to an IPv6 routing table to guide IPv6 packet forwarding. If an IS-IS routing table has routes destined for a specified network segment, but these routes do not need to be sent to the IPv6 routing table, run the ipv6 filter-policy import command and specify an IPv6 prefix list or a route-policy to allow only the required IS-IS routes to be added to the IPv6 routing table. Precautions The ipv6 filter-policy import command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. For a IPv6 named ACL, when the rule command is used to configure a filtering rule, the filtering rule is effective only with the source address range that is specified by the source parameter and with the time period that is specified by the time-range parameter. Creating an ACL6 or IPv6 prefix list before it is referenced is recommended. If a nonexistent ACL6 or IPv6 prefix list is referenced using the command, all IPv6 routes received by IS-IS are delivered to the IPv6 routing table. Creating a route-policy before it is referenced is recommended. By default, nonexistent route-policies cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent route-policy is referenced using the current command, all IPv6 routes received by IS-IS are delivered to the IPv6 routing table. Example# Filter received IPv6 routes using a route-policy. <Huawei> system-view[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 filter-policy route-policy test importipv6 import-routeFunctionThe ipv6 import-route command configures IS-IS to import IPv6 routes from other routing protocols. The undo ipv6 import-route command disables IS-IS form importing IPv6 routes from other routing protocols. By default, IS-IS does not import IPv6 routes from other routing protocols. Formatipv6 import-route { direct | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp [ permit-ibgp ] } inherit-cost [ tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * ipv6 import-route { static | direct | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp [ permit-ibgp ] } [ cost cost | tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * ipv6 import-route limit limit-number [ threshold-alarm upper-limit upper-limit-value lower-limit lower-limit-value ] { level-1 | level-2 | level-1-2 } undo ipv6 import-route { direct | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp [ permit-ibgp ] } inherit-cost [ tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * undo ipv6 import-route { static | direct | unr | { ospfv3 | ripng | isis } [ process-id ] | bgp [ permit-ibgp ] } [ cost cost | tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * undo ipv6 import-route limit [ limit-number ] [ threshold-alarm upper-limit upper-limit-value lower-limit lower-limit-value ] { level-1 | level-2 | level-1-2 } Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario If other routing protocols are configured on an IS-IS network, to forward traffic in the IS-IS routing domain outside the domain, use either of the following methods:
If there are multiple Level-1-2 devices in the IS-IS routing domain, optimal routes destined for another routing domain need to be selected. This requires all devices in the IS-IS routing domain learn all or some external routes. Configure IS-IS on a Level-1-2 device to import routes of other routing domains into the IS-IS routing domain. Alternatively, run the route-policy route-policy-name command to import some external routes from other routing domains. Prerequisites IS-IS has been enabled using the isis command and the IS-IS view has been displayed. IPv6 has been enabled for the IS-IS process using the ipv6 enable command. Precautions When routes of other routing protocols are imported, you can set the cost value and cost style of the imported routes. You can also configure IS-IS to retain the original cost value of the imported external routes. During route advertisement and route calculation, the original cost values of these routes are used. In this case, the cost style and cost value of the imported routes cannot be set, and static routes cannot be imported. After the ipv6 import-route direct command is executed, routes to the network segment where the IPv6 address of the management interface belongs are also imported in the IS-IS routing table. Therefore, use this command with caution. Example# Configure IS-IS to import static IPv6 routes and set the cost value of the routes to 15. <Huawei> system-view [Huawei] ipv6 [Huawei] isis [Huawei-isis-1] ipv6 enable [Huawei-isis-1] ipv6 import-route static cost 15 # Configure IS-IS to import OSPFv3 routes and retain the original cost value of the routes. <Huawei> system-view [Huawei] ipv6 [Huawei] isis [Huawei-isis-1] ipv6 enable [Huawei-isis-1] ipv6 import-route ospfv3 1 inherit-cost ipv6 import-route isis level-1 into level-2FunctionThe ipv6 import-route isis level-1 into level-2 command configures IPv6 route leaking from Level-1 areas to Level-2 areas. The undo ipv6 import-route isis level-1 into level-2 command prohibits IPv6 route leaking from Level-1 areas to Level-2 areas. By default, all Level-1 routing information, excluding information about default routes, is leaked to Level-2 areas. Formatipv6 import-route isis level-1 into level-2 [ filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | tag tag | direct allow-filter-policy ] * undo ipv6 import-route isis level-1 into level-2 [ filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | tag tag | direct allow-filter-policy ] * Parameters
Default Level2: Configuration level Usage GuidelinesThe ipv6 import-route isis level-1 into level-2 command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. For a IPv6 named ACL, when the rule command is used to configure a filtering rule, the filtering rule is effective only with the source address range that is specified by the source parameter and with the time period that is specified by the time-range parameter. Precautions Creating an ACL6 or IPv6 prefix list before it is referenced is recommended. If a nonexistent ACL6 or IPv6 prefix list is referenced using the command, all IPv6 routes in the Level-1 area leak to the Level-2 area. Creating a route-policy before it is referenced is recommended. By default, nonexistent route-policies cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent route-policy is referenced using the current command, all IPv6 routes in the Level-1 area leak to the Level-2 area. Example# Control IPv6 route leaking from Level-1 areas to Level-2 areas on Level-1-2 routers using IPv6 prefix list list. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 import-route isis level-1 into level-2 filter-policy ipv6-prefix listipv6 import-route isis level-2 into level-1FunctionThe ipv6 import-route isis level-2 into level-1 command configures IPv6 route leaking from Level-2 areas to Level-1 areas. The undo ipv6 import-route isis level-2 into level-1 command prohibits IPv6 route leaking from Level-2 areas to Level-1 areas. By default, Level-2 routing information is not leaked to Level-1 areas. Formatipv6 import-route isis level-2 into level-1 [ filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | tag tag | direct { allow-filter-policy | allow-up-down-bit } * ] * undo ipv6 import-route isis level-2 into level-1 [ filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | tag tag | direct { allow-filter-policy | allow-up-down-bit } * ] * Parameters
Default Level2: Configuration level Usage GuidelinesThe ipv6 import-route isis level-2 into level-1 command must be configured on Level-1-2 routers at the area border. The ipv6 import-route isis level-2 into level-1 command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. For a IPv6 named ACL, when the rule command is used to configure a filtering rule, the filtering rule is effective only with the source address range that is specified by the source parameter and with the time period that is specified by the time-range parameter. Precautions Creating an ACL6 or IPv6 prefix list before it is referenced is recommended. If a nonexistent ACL6 or IPv6 prefix list is referenced using the command, all IPv6 routes in the Level-2 area leak to the Level-1 area. Creating a route-policy before it is referenced is recommended. By default, nonexistent route-policies cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent route-policy is referenced using the current command, all IPv6 routes in the Level-2 area leak to the Level-1 area. Example# Configure the industrial switch router to perform route leaking from a Level-2 area to a Level-1 area using filtering policy 2002. <Huawei> system-view[Huawei] ipv6 [Huawei] isis 1 [Huawei-isis-1] ipv6 enable [Huawei-isis-1] ipv6 import-route isis level-2 into level-1 filter-policy 2002ipv6 maximum load-balancingFunctionThe ipv6 maximum load-balancing command sets the maximum number of IS-IS IPv6 equal-cost routes for load balancing. The undo ipv6 maximum load-balancing command restores the default number of equal-cost routes for load balancing. By default, load balancing is supported and a maximum of four equal-cost routes can participate in load balancing. Formatipv6 maximum load-balancing number undo ipv6 maximum load-balancing [ number ] Parameters
Default Level2: Configuration level Usage GuidelinesThe ipv6 maximum load-balancing command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Example# Set the maximum number of IS-IS IPv6 equal-cost routes for load balancing to 2. <Huawei> system-view[Huawei] ipv6[Huawei] isis 100[Huawei-isis-100] ipv6 enable[Huawei-isis-100] ipv6 maximum load-balancing 2ipv6 preferenceFunctionThe ipv6 preference command configures the preference of IPv6 routes generated by the IS-IS protocol. The undo ipv6 preference command restores the default reference of IPv6 routes generated by the IS-IS protocol. By default, the preference of IPv6 routes generated by the IS-IS protocol is 15. Formatipv6 preference { route-policy route-policy-name | preference } * undo ipv6 preference Parameters
Default Level2: Configuration level Usage GuidelinesThe routing policy can be used to set the preference for the filtered routes. If the preference is set, only the routes that pass the route-policy can apply the preference specified by this command; otherwise, routes apply the default value of the preference. Multiple dynamic routing protocols can be run on a industrial switch router at the same time. To properly select routes, the system sets a default preference for each routing protocol. If different protocols find routes to the same destination, the route of the protocol with a higher priority is preferred. The ipv6 preference command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Precautions Creating a route-policy before it is referenced is recommended. By default, nonexistent route-policies cannot be referenced using the command. If the route-policy nonexistent-config-check disable command is run in the system view and a nonexistent route-policy is referenced using the current command, the configured priority applies to all IS-IS IPv6 routes. Example# Set the IS-IS protocol preference to 20. <Huawei> system-view
[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 preference 20ipv6 prefix-priority (IS-IS)FunctionThe ipv6 prefix-priority command configures the convergence priority of IS-IS IPv6 routes. The undo ipv6 prefix-priority command restores the default convergence priority of IS-IS IPv6 routes. By default, the convergence priority of IS-IS IPv6 host routes and default routes is medium, and the convergence priority of other IS-IS IPv6 routes is low. Formatipv6 prefix-priority [ level-1 | level-2 ] { critical | high | medium } { ipv6-prefix prefix-name | tag tag-value } undo ipv6 prefix-priority [ level-1 | level-2 ] { critical | high | medium } Parameters
Default Level2: Configuration level Usage GuidelinesThis command takes effect only in IPv6 base topologies but not in VPNs. The convergence priorities of IS-IS IPv6 routes are classified as critical, high, medium, and low in descending order. After the ipv6 prefix-priority command is run to set the convergence priority for IS-IS IPv6 routes, the following situations occur:
The ipv6 prefix-priority command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. After the ipv6 prefix-priority command is run to set the convergence priority for IS-IS IPv6 routes (including IS-IS IPv6 host routes and default routes), the convergence priority of all the IS-IS IPv6 routes that meet the matching rules is changed according to the configuration of the ipv6 prefix-priority command, and the convergence priority of the IS-IS IPv6 routes that do not meet the matching rules is changed to low. Example# In an IPv6 base topology, set the convergence priority of IS-IS Level-1 routes with tag value 3 to critical. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 prefix-priority level-1 critical tag 3ipv6 spf-priorityFunction
The ipv6 spf-priority command configures a priority for SPF calculation in an IPv6 base topology. The undo ipv6 spf-priority command restores the default priority for SPF calculation in an IPv6 base topology. By default, the priority of SPF calculation in an IPv6 base topology is 64. Formatipv6 spf-priority priority-value undo ipv6 spf-priority Parameters
Default Level2: Configuration level Usage GuidelinesA higher priority of SPF calculation in an IPv6 base topology means that the routes in the IPv6 base topology are converged preferentially, which ensures the proper operation of important services. The ipv6 spf-priority command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Example# Set the priority of SPF calculation in an IPv6 base topology to 30. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 spf-priority 30ipv6 summaryFunctionThe ipv6 summary command configures IS-IS to generate IPv6 summarized routes. The undo ipv6 summary command disables IS-IS from generating IPv6 summarized routes. By default, IS-IS does not generate IPv6 summarized routes. Formatipv6 summary ipv6-address prefix-length [ avoid-feedback | generate_null0_route | tag tag | [ level-1 | level-1-2 | level-2 ] ] * undo ipv6 summary ipv6-address prefix-length [ level-1 | level-1-2 | level-2 ] Parameters
Default Level2: Configuration level Usage GuidelinesThe routes with the same prefix can be aggregated into one route. This can reduce the scale of the routing table, the size of the LSPs generated by the local industrial switch router, and the scale of the LSDB. The aggregated routes can be the routes discovered by IS-IS or the imported IPv6 routes. After the aggregation, the smallest cost among those of the routes that are aggregated is used as the cost of the aggregated IPv6 route. The ipv6 summary command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command. Example# Set a summarized route fc00::/32. <Huawei> system-view
[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] ipv6 summary fc00:: 32isis ipv6 costFunctionThe isis ipv6 cost command sets the link cost value of an IS-IS interface in an IPv6 topology. The undo isis ipv6 cost command restores the default link cost value of an IS-IS interface in an IPv6 topology. By default, the link cost value of an IS-IS interface in an IPv6 topology is 10. Formatisis ipv6 cost { cost | maximum } [ level-1 | level-2 ] undo isis ipv6 cost [ cost | maximum ] [ level-1 | level-2 ] Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario On a large-scale IPv6 networks, there may be multiple valid routes to the same destination. IS-IS uses the SPF algorithm to calculate an optimal route and transmits traffic over it, which brings the following problems:
To solve the preceding problems, run the isis ipv6 cost command to set IPv6 link costs for interfaces so that traffic can be transmitted over different physical links. Prerequisites IS-IS has been enabled on a specified interface using the isis ipv6 enable [ process-id ] command in the interface view. Configuration Impact If the link cost of an interface is changed, routes will be re-calculated on the whole network, causing the changes in traffic forwarding paths. The priority of the ipv6 circuit-cost command is lower than that of the isis ipv6 cost command. If the IPv6 topology type is compatible or standard, the IPv6 and IPv4 link costs are the same on an interface even though the IPv6 link cost set using the isis ipv6 cost command is different from the IPv4 link cost. The IPv6 link cost set using the isis ipv6 cost command takes effect only when the IPv6 topology type is compatible enable-mt-spf or ipv6. Example# Set the IPv6 link cost of GE1/0/0 to 50. Huaweisystem-view[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] quit[Huawei] interface gigabitethernet 1/0/0 [Huawei-GigabitEthernet1/0/0] ipv6 enable [Huawei-GigabitEthernet1/0/0] isis ipv6 enable [Huawei-GigabitEthernet1/0/0] isis ipv6 cost 50 isis ipv6 enableFunctionThe isis ipv6 enable command enables the IS-IS IPv6 capability for an interface and specifies the ID of the IS-IS process to be associated with the interface. The undo isis ipv6 enable command disables the IS-IS IPv6 capability of an interface and disassociates an IS-IS process from the interface. By default, the IS-IS IPv6 capability is disabled on an interface. Formatisis ipv6 enable [ process-id ] undo isis ipv6 enable Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario After completing the configuration of an IS-IS process in the system view, enable IS-IS IPv6 on the interface that runs IS-IS and associate the interface with the IS-IS process using the isis ipv6 enable command. Prerequisites The following steps have been performed:
Precautions An interface can be associated with only one IS-IS process. To perform IPv6-related IS-IS configurations, you must enable IPv6 first. Example# Create IS-IS process 1, enable the IPv6 capability, and activate the IPv6 capability on GE1/0/0. <Huawei> system-view[Huawei] ipv6[Huawei] isis 1[Huawei-isis-1] network-entity 10.0001.1010.1020.1030.00[Huawei-isis-1] ipv6 enable[Huawei-isis-1] quit[Huawei] interface gigabitethernet 1/0/0 [Huawei-GigabitEthernet1/0/0] ipv6 enable [Huawei-GigabitEthernet1/0/0] ipv6 address 2002::1/64 [Huawei-GigabitEthernet1/0/0] isis ipv6 enable 1 isis ipv6 suppress-reachabilityFunctionThe isis ipv6 suppress-reachability command suppresses the advertisement of direct routes on an IPv6 interface in a specified topology. The undo isis ipv6 suppress-reachability command restores the default configuration of an IPv6 interface. By default, the advertisement of IPv6 addresses on an interface is not suppressed. Formatisis ipv6 suppress-reachability [ level-1 | level-1-2 | level-2 ] undo isis ipv6 suppress-reachability Parameters
Default Level2: Configuration level Usage GuidelinesYou must enable the IPv6 capability for an IS-IS process before running this command. For details, see the isis ipv6 enable command. Example# Suppress the advertisement of IPv6 addresses on GE1/0/0. <Huawei> system-view[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] quit[Huawei] interfacegigabitethernet 1/0/0 [Huawei-GigabitEthernet1/0/0] ipv6 enable [Huawei-GigabitEthernet1/0/0] isis ipv6 enable [Huawei-GigabitEthernet1/0/0] isis ipv6 suppress-reachability isis ipv6 tag-valueFunctionThe isis ipv6 tag-value command configures the IPv6 administrative tag value on an IS-IS interface. The undo ipv6 isis tag-value command deletes the IPv6 administrative tag value on an IS-IS interface. By default, an IS-IS interface has no IPv6 administrative tag value. Formatisis ipv6 tag-value tag [ level-1 | level-2 ] undo isis ipv6 tag-value [ tag ] [ level-1 | level-2 ] Parameters
Default Level2: Configuration level Usage GuidelinesUsage Scenario Using the isis ipv6 tag-value command, you can set the administrative tag value for all routes of a specified IS-IS process. The tag can be used as a filtering condition of a route-policy to filter routes. Precautions You must enable the IPv6 capability for an IS-IS process before running this command. If the IS-IS cost style is wide, wide-compatible, or compatible, the administrative tag for an interface is advertised using an LSP. Example# Set the IPv6 administrative tag value of GE0/0/1 to 77. <Huawei> system-view[Huawei] ipv6[Huawei] isis[Huawei-isis-1] ipv6 enable[Huawei-isis-1] quit[Huawei] interface gigabitethernet 0/0/1 [Huawei-GigabitEthernet0/0/1] ipv6 enable [Huawei-GigabitEthernet0/0/1] isis ipv6 enable [Huawei-GigabitEthernet0/0/1] isis ipv6 tag-value 77
What is the command use to enable IPv6 in router?The list of CLI commands for the configuration of IPv6 is as follows: ipv6 enable. ipv6 unicast-routing. ipv6 address - prefix prefix-len.
Which command must be enabled on router to enable routing for IPv6 packets?Before configuring a static IPv6 route, you must enable routing by using the ip routing global configuration command, enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command, and enable IPv6 on at least one Layer 3 interface by configuring an IPv6 address on the interface.
Which command can be used to create an IPv6?On the command line, type ADDTCPIFC (Add TCP/IP Interface command) and press F4 (Prompt) to access the Add TCP/IP Interface menu. At the Internet address prompt, specify a valid IPv6 address. At the Line description prompt, type *VIRTUALIP and press Enter to see a list of optional parameters.
How do I enable IPv6 routing on packet tracer router?Configure IPv6 addressing on the Accounting Server.
Click Accounting and click the Desktop tab > IP Configuration. Set the IPv6 Address to 2001:DB8:1:1::4 with a prefix of /64. Set the IPv6 Gateway to the link-local address, FE80::1.
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Which of the following commands must be used to enable a router to perform IPv6 routing?
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